Sex chromosome anomalies belong to a group of genetic conditions that are caused or affected by the loss, damage or addition of one or both sex chromosomes (also called gonosomes).
In humans this may refer to: +AnomalyFrequency45, Y Not a viable organism, as the X chromosome contains genes that are fundamental to life.45, X, also known as Turner syndrome1 in 2,000-5,000 (female)45,X/46,XY mosaicism, also known as X0/XY mosaicism and mixed gonadal dysgenesis1 in 15,00046, XX/XY47, XXX, also known as trisomy X or triple X syndrome1 in 1,000 (female)47, XXY, also known as Klinefelter syndrome1 in 500-1,00047, XYY, also known as Jacobs syndrome1 in 1,000 (male)48, XXXX, also known as tetrasomy X1 in 50,000 (female)48, XXXY1 in 50,00048, XXYY1 in 18,000-40,000 (male)48, XYYY12 recorded cases (male)49, XXXXY1 in 85,000-100,000 (male)49, XYYYY7 recorded cases (male)49, XXXXX, also known as pentasomy X1 in 85,000-250,00046, XX gonadal dysgenesis46, XY gonadal dysgenesis, also known as Swyer syndrome1 in 100,00046, XX male syndrome, also known as de la Chapelle syndrome1 in 20,000 In this list, the karyotype is summarized by the number of chromosomes, followed by the sex chromosomes present in each cell. (In the second and third cases the karyotype varies from cell to cell, while in the last three cases, the genotype is normal but the phenotype is not.)
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